分泌体，指在球状或不规则形状的岩石空洞中，由胶体或晶质物质自洞壁向中心逐层沉淀而成的矿物集合体。
对这些分泌体的可能具有的功能进行了探讨。
The possible functions of these three kinds of serections are discussed.
当一种叫淀粉样前体蛋白（APP）的分子被两种酶——分别叫作贝塔-分泌酶和伽玛-分泌酶——切断时就形成了淀粉样斑块。
Amyloid plaques form when a molecule called amyloid precursor protein (APP) is chopped up by two enzymes known as beta-secretase and gamma-secretase.
说得更恰当一点，粘液是壁状支气管粘液腺渗出的分泌物，呈胶粘体存在。
Rather, mucus tends to occur as ropy strands of secretion exuded from the mural bronchial mucus glands.
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